66
29. Changing the bevel gears
Note:
Always change bevel gears in pairs.
Removal:
• Remove the mains plug of the machine.
• Remove the detachable work support.
• Unscrew and remove the three fastening screws of the baseplate.
• Remove the three connection plugs 4, 5 and 6 from the circuit board.
• Unscrew and remove both fastening screws 7 on the free-arm cover.
• Bring the feed-dog lowering mechanism to the normal working position.
• Using a small screwdriver, disengage both feed regulators 8.
• Remove the free-arm cover carefully from the housing to the left and place it aside the machine.
• Remove the needle plate.
• Remove the buttonhole sensor and place it aside the machine.
• Dismantle feed-dog lowering mechanism 117 (fig. 70).
• Disconnect both pull-springs 3 and 9.
• Unscrew and remove screw 64 of the bobbin case position finger 65.
• Remove the bobbin case position finger.
• Turn the handwheel until the lobe of feed eccentric 5 is at the rear.
• Unscrew and remove screw 4 and clamping plate 21.
• Fold feed regulator 6 downwards and remove it with link 7 to left from the driving bar pin.
• Loosen the three screw 29 on the lower flat-toothed belt sprocket 102.
• Unscrew and remove screw 118 of feed eccentric 5.
• Unscrew and remove screw 60 of lifting eccentric 119 (fig. 71).
• Move hook driving shaft 28 as far as possible to the right (fig. 70).
• Loosen screw 22 and remove pin 23.
• Unscrew and remove screw 10 of clamping plate 120.
• Remove the left cylindrical pin 12.
• Unscrew and remove both fastening screws 121 of the hook bearing.
• Pull feeding stroke shaft 14 slightly downwards and dismantle the complete sewing hook together
with lifting eccentric 119.
• Loosen boths screw 58 of the sewing hook.
• Pull the small hook driving shaft with bevel gear 59 downwards to remove.
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